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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50928c7dcc95f58666e0f4cdca3d2e75f6f5418eb3f4d7e5fb2cbaa67e6bd618' 
  AND token = 'wczt0BVxzVczL4kMxVNhWMZhzmAbRxuyuvE34ak36as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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