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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32442aec7c401bbf6ac2eeb604200e8986441ef3c32c4b09d4c7156955ac2ccb' 
  AND token = 'K+UYmyyqWrwrhBCpcNEo2ZNg1I7FwGBw2xVOJq0pdf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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