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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e7cbf65757c979e674382fb6727727482fe1d1dff53dc0110bcc18989421f0' 
  AND token = 'fQxD47cHH62QTGZtei3pJUnmFT7xFGYvKNeGQ0alemI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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