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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4368ad4afd8ac8851642d48b0ce9020a1ededbf7baef95073f81d0301f2754e' 
  AND token = 'e/w1r0mEjpvABqKFeAShwA2+nGW17/jvxkM0/7RzALE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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