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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7e20df2fbc2c992ae869c2e6b7d76c9911f573fdc828bff939bd775470defc' 
  AND token = 'a0p9q7fPIr+rABvydT8GPsd5FkgrZyJ2hhrW2qUB5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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