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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a846b1eaed667ffcbefc41ba6d389b5609359efffb0bb2b195babf5636ab1e' 
  AND token = 'wARBWJE+RYyBXFAJCno7z+1uhNI2RoI8gnS7KNxrA8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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