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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6d6c435f332e9631e5a86714e1d0d942f9141445544dff06c4dba18ab3b2b7' 
  AND token = 'Sywh3fvTlniKCYCrnOWgV1p2zFtI3xM5hjpedhQtzRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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