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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7b6b5a444d9ddb685a7275670a71843206577f7dc1143cb3b427b5b2964a62' 
  AND token = 'WEP0LAj2nbYFH83SqzpCuGDk1SftI9PNSGa8vZQnZQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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