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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e77599abb975d0284e680382f0a9d7b4cb8e14c4f2fff655058348c39968c9' 
  AND token = 'bI7L8PIAMvpWa1PRlgj3WnMAboW4UoShCXZ/TtyLV0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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