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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0696ccb9cfcf6947567bb43c43c557af2957c4ab250f8d1e2cb1ef97a9e94cf4' 
  AND token = 'ryeT7WruyR4gvpr0Dh1MAy4ePdO5YW4cHAtwegHkSWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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