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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf1c06b6deda7c177268271dcea482f6a6247cb8bda7f18d1fbe95f4e1af3a1' 
  AND token = 'neRgP65HRlkpJ2On4amJ/j5NG0qFA/WcHTogoIt2tHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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