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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bf45da4fa0ae638189d4cbd20b73f52fdb834b31421de80672dc08019ff7de' 
  AND token = 'paUaf+J2bhuIJifv1VfHTstgP0LvA6ufPzbT9HiC19A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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