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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cd208ab499bc2a01173a1ef61a650f1816f3e7fbe298f541f3ca04ad416dd3' 
  AND token = '+egqgEyKY+HmUYh/dCiEasc6kNNbf95Xixag0ehTQEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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