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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd29320db4fe1b95b795849cfe1f9bfa3b5acc563c841f64b71b8d9802b0b5f3' 
  AND token = '/m8k603axG/mc9DB9fdiZxXV6E6eUmbqR4eSTHKDvZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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