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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8c6ddf2a6d3d59af9ae0eabaa04a0a3b47fa6cd7dabcd061db6bdb3b665cfd' 
  AND token = '0HCuwhbz79rBrCFpKuxvM9M5AmzrQBfgf8aeonuo448=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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