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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33e5f7b0cd8886868501e422899d74b7a4274cd144b48b8faf3ab111146e30c' 
  AND token = 'becf3mSM82SrWAi9fWGOKF3hEopttff1F2EQeAPX2DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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