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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd44de2b92f1a103cc00b13d18b0f91ea85fb50159fd67bce7d56f1ade05a07' 
  AND token = 'ks96/xYCpHPodeFhp1lPQ9oEJE5o8uM+hl6YNIq+dxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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