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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f5ae06b797a531cb892a79fab0d35a3d3260837fe26f916aba75104d6913b' 
  AND token = 'KwgcAfsQA46DFSbfN6DEYo8QsKgd1rLfvDvHT0hmBzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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