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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5206f5b6a28e548c767270f728f2845ee9f4f6ca8e779bebcadd6a030068948b' 
  AND token = 'xPCX3aP8eu5w/owzfVO2EfxNUwCUzCaBAyY0B9hUf4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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