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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d70645fbe5d90f70c42cb99d1af226ee2d54a9b83f0093814f11275a7333db6' 
  AND token = '/r76uTGPmGwnuLEGCrPQJ07fVyE0quDYd1BtW2wdt2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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