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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a9495a0d416209f69ecfc9886af227d3d2a6539e89b0c88cfee10b3b2a5a7b' 
  AND token = 'd1nXY5iNCvuhvbrFoGc7onMAmnfLRqwmtv9PhUeIe0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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