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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98797017d9f8c01333631682eba647d3588048b4f9b17c14e13794b28d40bc5' 
  AND token = 'JtHrONGg5wtNHrvQbfY9EQPGDcmY+5NJzlAdP7VkyUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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