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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fe6b9ae5301f9411b8021893b4077d1b75f0e7194625ce80f713c0e6ca8fab' 
  AND token = 'l5CQnYxsOuuWbZ7E6PKg+AjTJHNVoISY5VZgJerEVTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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