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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c015af9d622d9a907176bf1f06e6051736ce5dc053057f2934eab360c6590c' 
  AND token = 'HaGy2QlxtGA04f/PpmdMZhqMysPjs3vViMOoVu3P0nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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