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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ba9ceb08b2fe8681c4642aab65df531bce532683dea26c91180f98bc089d16' 
  AND token = 'CQ4wECMQvmYmc6+aiPr+XgTIwGFX2+RlCHsC99kU270=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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