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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79463e53312eb11077991ef2451288d7ce99c45b27cb25ebf4e41be6788d7624' 
  AND token = 'J+G9R4HGL1dJwiSKH/eqavKvLk6x66AwOeyn3+OgdyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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