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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524aaeb9767ecaf1ee7722f7e8da9cc97a0c2c374343a31655d7c5fd8e3a665c' 
  AND token = 'Va2eLz0uC85fbi2x5qvU6Wg2LAV44vDsZ0hb+UGD4ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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