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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1435a4e29300738f9d54a8a26330749752b0c726e2bb064f7a3219bfe53ff17' 
  AND token = 'hhW39Q7udL9GSZyh61uxjqpWXYocXkW8szep74eUMp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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