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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4506aa71b37dfe0ed77e143fdf68cca3539641c1525c6854264209445afd8d40' 
  AND token = 'BJ/kMUETEVKn8RlP0jQM0FaTm1K1Z0yAM7ridlUuDqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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