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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a4b029e97d95e8a44212f0451897913fe165639b91e4b9e6925460cd942acf' 
  AND token = 'iCkCmBdKK9vPDP3/H2DDd5sFsri7cv47/GvYeBHzywg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}