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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e03c70fb0f946c5c4390d696b63e5f9ea97eed5ef472210161176e8bd1c818' 
  AND token = 'dl0FbyqhGCSnlzEsWrk7i+c0CrftJkarW74mFmQYVNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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