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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b04d8e135b25a594fde4838f307d51bae483b5852bb765b5357e6af1779edcf' 
  AND token = 'cbbMqgNhpz+eX9bnWbHGY6l3CnA3pESx9pTvuUwHKQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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