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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1d4c5ffe74e7308cb18d80bbb1706bbc5a0b422165b6ae9390d80a81d69e0f' 
  AND token = 'QJgN3shbYxhtll1x2hwy79VBJ2U5op7sU4BnfmIjxDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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