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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d016f62da36c47defada89d5e4a0f60bab54c103c34a297b21e75e76071646a' 
  AND token = 'KAMwnS7a5Bvqq0DDyzd8biFsMixUUIRtow2nOCp27qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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