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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe40fc29f92ceadc82e37153f22a3d312e399a3a6e099cd9b481d9e2936ec73' 
  AND token = 'SnGsS2vUJI2Br/PEb2kSwMsKFI3gd0R6DabtwRYitFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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