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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736ac8c72c052ae384ef822fa38107532783870e03641a321f03d626a2a6ae01' 
  AND token = 'rVJmBh/ozDjp832IG8rKiTqR/jR27vgfIz/Qf17GWTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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