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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb46e47348875eddbc58284dd7edf63833c108c6262b29f11ce46b4ef126eb5a' 
  AND token = 'USZt8iIBIjOVDQF1cH0HV2k7qchU8DkTlAekgvqhvUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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