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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3670d33cd39449e3301621f73371378bd96fb955ff07d91f69fc1341406d833e' 
  AND token = '/ZIIbabYQRrT4JvMmG8M6vHuTnBDfZoYsBf5AD0F2y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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