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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b11d75cc54cb7a46d007ccc88843d6e4fd3e9dcadb5c4dcb60fb130d99c6952' 
  AND token = '/9o+AJRv0iQChSgho9YwG8DurQudgJ84LvwBTv7zroE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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