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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f82b20227e42429df63b0a39a3ee9d8ee9f1fae8e5f0395dad7a90b38925673' 
  AND token = '5D+rxaY071bfMlswHIhgAOt+c4lIZOQ5Gd+OlAfkF+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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