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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1de72496f208c17087bec909d367088bea1165a9490bd8658c369dc016d119' 
  AND token = 'zf4zAbHnjpOIovJoG4Emkqj5lmwnrOiPwdqAVn3TR1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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