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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d5a0e2d94cc533e617e68b6b5f247323a0949f6829d4c89e13ee2eebe12c9c' 
  AND token = '6jJS2zsfGjfitM+KAuyfeWjHCfRwuz702hSwSexkxXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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