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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebff4feed4b03ea5a4ff8d6cdecf8900c308808f6fecfe4bf72543a32a28cca7' 
  AND token = 'r0YjR2PmEuhkKDdXY0l6WTKTgDX19rOXC586DWuQlbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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