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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b29a682ad794f93357001f61dd90a434b5a376476f04bfe199970af759ef966' 
  AND token = 'hY4Cmn8LwugPKatXxaTpL0EQ9w6HLifO4WjDAssPnoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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