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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bc015b7bc86db72d926a940ee099620144f1fceb11ad92c6981d2862b6715d' 
  AND token = 'QfFOQM31uUIW3currYvFkd7468wFJy0ZHaAZNgertAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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