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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c52490fb04bb0430aa97bd0c1ae4cd1a2d8102f8e2ed8e0c5ff2e7d8f53980' 
  AND token = 'J4UQek3DEZzXX0pFoNJFHnagTUTb/AC/794lkAlKJj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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