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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af68b889d787d1ba3d89c0a6f44fa36a6e0f8f30c09bcd6b3fc41f822306a7ee' 
  AND token = '0N//R1D+jxQxP3Kg/quOOaf0lo5087WcUKke1kYBk/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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