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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86612b94834a59dc104915951adfe76c2427e8f69e58c28d9dcc674add7fe15' 
  AND token = 'O1z5qqOjqzaEdK9tt62FYpH87ncnzM3Pd1y8H178vTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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