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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75501308feda3360e04b562d8f00371798fbb923f1546c838c4554650a9205a' 
  AND token = 'BSJZHbzfGGYXCG8dh8XLbH20+RQtnEX7e3jdaAc5G0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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