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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3ac0248e6ea22c04cb0ca4a964dec3fa1eaf87f02d746e54db509b537f1176' 
  AND token = '7EX8/uoAmgje3w9rtggMv1pamrfeOvBoYDbQf5Sxy/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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