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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dedd0acd621ac53534193c4506c8ce8f02580a6b4ed1bdf3912b647c398492b' 
  AND token = 'y8f6WnnuLI67k3L9OVXhYkz9zQcJ/tFdoAeP5tXyQfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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