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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9d34c122b3a9146c4be102fa265cb824f4fa71da9f4e16c141bbbc2dd27428' 
  AND token = 'Pw/TYQqcx0FeQqfQT3eXoEfC/cXQ7l3d5/efUCQH8VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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