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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c91686a2653212bbfeb8bf21244b7afcf92d1e160fa269b40e42f557b34caa' 
  AND token = 'FG0DtT34YpYHqQ8q66x8VJEOFy0ukDc8geBQcaUkemM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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