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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc0223ac1b583e3d3752640f684d39e8cef0b60f75cdb3dd274f37ce2d33b41' 
  AND token = 'OSWDpGbCrZM9bleAJJ9nQUyVml7EkW1cSF37ybf1Ycw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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