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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02a4b1ae48394440046ed3f02ca9c2c52296191b3439e9fa0d48913c7fcfa0f' 
  AND token = '/d75zKlJRqHNNmn/Zy2+qDrYDFSrQWxskaMhYfGYScg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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