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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4e613d34d5ca41dd711eae2d2bf6eec1d76aa77bd9bd9125933aa310d61192' 
  AND token = 'R0tFR3XTs8Yhtu6BbTRRweOP5yDaTK5fKw/d9erFSc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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