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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdef772d19a893ac55c8937818c844cb86b5c2365ab144e60248902b63b5c70b' 
  AND token = 'N6QyuQuPAwirN071oHfNdyUj6Bc1mHT07b3NEZ09Sw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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