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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cdf3f90e07dcfb71e2dd53dd056324071ef6fbe2fdc6ceab3790b582ab1012' 
  AND token = 'LPSjz7ln6TXDcSne7HUWeofViuXim4Ene8CCfhUU2nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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