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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013b6fc60bc482845ec182ca27b5f31b532a6af47dccd1a64098efbf9b67ddb1' 
  AND token = 'Wq67vnPPGOmmElWRju7cM/tqZHaZGv1T/ss39N6DiA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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