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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989e381c6cd387dcee80494beb49cd536c94e71bec50db6f8c15661cb16ef128' 
  AND token = 'jLEz5ENe/awppQqTHj2vv9KkrCzwjhbMATPn6Da/kKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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