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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e2f4b2b558af4c213bd84e4e4d7a6931f057f6041ea67b18dea39ce3d0bbe5' 
  AND token = 'sLkQE073tY7AROhyqV/g3g+FLFmZcRt6aYiFeULeqAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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