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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5759a0cb6d0398600585171810ac9ad27bb1c01fe9f0d6f86d85f103db209d2f' 
  AND token = 'bco4gfZxv8MCrvh3M/lyuFjUi8qEHBIGBi8bXdyq5/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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