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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7ab19865061e7578c8e17806ac302330a8a6264cfd9555c7b29f04ca395f3b' 
  AND token = '990vgtqb8o53mvLWByv4ho1jfLEjQQ5TsLpGcdAsg6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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