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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8876738ef7e69e0bbd7abca06a14d899c6cfa82d8c271a4a47657f34c0f68cc0' 
  AND token = '1ebWsuNxxd72V/UCvaKE2wI7+3ZPhNLvYAY4P0COxRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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