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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74810740270883d1f1ec3b37703d6ff8ad795601e2071de72ef41bef357be009' 
  AND token = '1YzilM8lj7J037wuLQZDfnSkMVDSOVxvDKRVLOAyw1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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